Draft apparatus for furnaces of steam-boilers or the like.



l PatenT-ed Jan. 2|,v |302` w. smak.. DRAFT APPARATUS Fon 4FuRnAclss 0F STEAM BolLEs on THE 'ufKEi v (Appueaeion med .Tuna 14, 1901.) y

,2 ShelTtv-Slfnawtv L (No Model.)

Tzvfe'zzzfar. cazvze6-Mzfoc Q-LITHO., WASHINGTON. Dy C.

I. f //l co, PHoT No. s9|,e,72. s A Patent@ Janjzl, |902.

.1. w. sTocK. l DRAFT APPARATUS FDR FURNAOES 0F STEAM BDILAERS DBATHE LIKE.

(Application led June 14, 1901.) (No Model.) 2 Sheets-Sheet 2.

Wiiemms I 'J' A. 71222672??? I the boiler.

UNITED TATES PATENT OFFICE.

JAMES WOOD STOCK, OF NOTTINGHAM, ENGLAND.

Y DRAFT APPARATUS FOR FURNAC ES OFSTEAM-BOILERS OR TRE LIKE.

sraorrrcarrolu forming part of Lettera Patent No. 691,672, dated January 21, 1902.

Application flledJune 14, 1901.

T0 all whom it may cowern.-

Be it known thatI, J AMES WOOD STOCK, a subject of the King of Great Britain and Ireland, residing at Nottingham, in the county of Nottingham, England, have invented new and useful Improvementsin DraftAppar-atus for Furnaces of Steam-Boilers or the Like, of which Ithe following is a specification.A

This invention relates to apparatus or arrangements of air-pipes tobe applied to steamboilers ofV all kinds-stationary, locomotive, and marine; and it has for its object to insure perfect combustion of the fuel, absence Of smoke, and utilization of the waste heat radiated from the boiler and in the'uptake.

- For the purpose of my invention I provide in a suitable position relatively to the fur-V nace-chimney or between the furnace-chimney shaft and the furnace or back of the boilerl or in the chimney-stack a number of tubes disposed in one or more rows, said tubes being Open to the atmosphere at one end and connected at the other to a `pipe (or pipes) which passes at the side of the boiler and in front of the furnace, whereit (or they) opens (or open) into the furnace through the coaling-doors. By this arrangement air is drawn into the tubes near'the chimney and at the hottest or a very hot part of the ilue, and after absorbing the heat which would otherwise be Wasted isv caused to pass through piping above the level of the furnace-bars or furnaces and close to the boiler, and thus absorb the heat radiated from the boiler. Itis thence conducted to the front of the furnace and delivered above the fire -bars upony the fuel, either as a forced or natural draft, at a temperature of 400 to 900 Fahrenheit. The arrangement and construction of the piping and parts and the dimensions thereof, as well as the number of air-inlets, must Obviously be varied according to the design of the boiler and furnace; but in general construction the arrangement is as shown in the annexed drawings, in which- Figure lis a cross-section at the back of Fig. 2 is a planand Fig. 3 is a front elevation, of a boiler of the Cornish or Lancashire type with my invention applied thereto. Fig. 4 is a detail in elevation of the seiiai'no. 64.574. (ND modal.)

connection between the sections of the air l passage or pipe, and Fig. 5 is ra sectional plan view of the same. l t

a represents the air-inletpipes, which may be vertical, as shown, or .may be horizontalor inclined. They are arranged in the fluenear the uptake, so that the gaseous products of combustion pass between and around them,

and said pipes may be cast or composed of Vsteam-pipe or of any kind of metal. Their Openings b for the inlet of air may beprovided With a fan near the furnace-chimney.

The air is received from all said pipes a intov pipes yc, and from these the air is drawn either by the draft of the lire ortotherwise along the pipes dover the'top of or at the back of the boiler and from these in vtwo or l more streams through pipes e, by which it is conducted to the front of the boiler or furnace, as seen in Fig. 3. The air, which has been highly heated in its passage through the above-mentioned piping,is now delivered through the open ends g upon' theburning fuel in the furnace, and thus facilitates the combustion of the fuel and increases the draft and velocity'with which air is drawn in at the openings b at the same time.

Variouschanges within the scope of the appended claims may be made.

The back draft on opening the coalingdoors is avoided by the construction of the joint in the piping at the door or doorsvof the furnace. The pipe is divided at an angle, as seen at hin the plan view, Fig. 2, and in the detail views, Figs. 4 and 5, so that when the coaling-door is closed the two sections of the air-pipe are in alinement; but on opening the coaling-door the mouthpiece g separates from the remainder of the pipef, thus causing communication between the interior of the furnace and the pipef to be cut off at the joint,

IOO

abutting faces being beveled and one of said sections being connected with the door of said furnace.

2. A steam-boiler and its furnace combined with a pipe for supplying atmospheric air to said furnace, the pipe being arranged to be heated by the gaseous products of combust-on during their passage to the chimney, and including two separable sections having abut- Io ting beveled faces one of which is located in I the ue, near to the uptake and leads to the front of the furnace, and the other of which is connected with the door of said furnace.

In witness whereof I have hereunto signed my name in the presence of two subscribing 15 witnesses.

JAMES WOOD STOCK. Witnesses:

ELLIS WELLS,

ROBERT ARTHUR HALL. 

